Electric resistance furnace



April 14, 1925. 533,224

- 0. A. COLBY ELECTRIC RESISTANCE FURNACE d I I f I glle Maro h 10 159,22

Fig.1

lNVENTOR 6 0m A. Colby.

ATTORNEY inc my invention;

ably secured thereto,

Patented Apr. 14, 3925,

5.615. A, CULFBY, QF'IRWIN, PEWEZTSYLVANIA, ASSlG-NOR TS WESTINGHOUSE ELECTRIC &

IZZJlNUFAGTUEENG COEZ'PANY, A CORPORATION 0F PENBE'SYLVAZRTZA.

ELECTRIC RESISTANCE FURNACE.

Applicaiun filed liiaroh 16, 1322. 5erial; No. 542,669.

To all whom it may concern:

Be it known that l", Um A, Comm, a citizen of the Unitecl States, and a resident of Irwin, the county of Westmorclencl and State of Pennsylvania, have invenlecl a new and useful improvement in Eleceric ance Furnaces, of which the following is a spccifiics zion.

invention relates to electric and periiciilarly to electric-resistance furlessee e116. it has for one of its objects m provide a. relatively simple and inexpensive refmcfiory heating element for an electric-resiss'zaiice' furnace which may be eesily and quickly assembled 'enfi disassembleci.

Another object of my invention 18 to proviile a furnace structure which shall cooperate with a heating element of above indicetefl character to maintain i e per-ls thereof in close operative engagement 0.. ing; "the og iemtion of the fumes-e practising invention, l plum-lily 0i refrecieiry Walls s11 furnace chamber, two oppo-z" WfillS hau ing a ledgi or Sllfilil portions on which are locstml a plurzili 1 of refraccory conducting blocks, each provicled vgi'th ewe grooves in its uppei" face. A plm'ality of elongated refractory I'ESlSiJOI members e:=:-

tend beiween the shoulder portions with their ends restingin the grooves in the re spective conducting blocks. The roof portion of? the furnace is so arranged as to rest upon the ends of the resistor members to press them into close operative engagement with the conducting blocks.

In the single sheet of drawings,

Figure 1 is a View, in verfiicel longitudinal cross "action, of an electric "furnace embodying. 2 1S View, in vertical lateral crosssection, taken on the line H ll of mg. l; f 3 is a View, in lunizo ntal cross-section, taken on the line llL-lll of Fig. 1, and

Fig. 4i is a fragment-airy View, in vertical lateral cross-section, of :1 modification of the device embodying my invention.

An electric-resisiance furnace, (lesiq'natecl by the numeral 11, comprises an outer metallio framework or skeleton 12, provided with a plurality of supporting members 13, suit- An outer liningl comprisesaplurality of bricks '01" blocks of any suitable refractory heat-insulating loaierizil. An inner lining 15 comprises a plw rality of bricks or blocks of a suitable higl'itemperature-resisting refractory material, oonstitut-ing'theifloor and side walls of a furmace chamber 16, fiche bricks or blocks core stituting the two linings being so shaped and disposed as to enclose a furnace chamber of any suitable or desired contour and dimensions. The end. Walls are illusl-mteci in Fig. 1 oi the drawing comprising only 2, single brick for the entire Well, as may be possible in a small furnace, jecting ledge or shoulder portion 1'? to provide a support for a heating element or re SlSiJOY. to be hereinafter described.

A. plurality of iefracmry comluciing blocks 18, substantially Lila]? in. con-- cont, :ue locatcil upon the ledges 1'7 excl each is providecl with two substantially semi-- e34. meal grooves in. its upper Scarface. A nlu 3 01 reflector TQSKSQOK? iii embers 19,

of i'ocl lone, extend icii ii, c the "top of the furnace chamber, ends resting in the grooves in the refractory comlucting blocks 18. The conducting blocks 18 disposed in staggered relation to each other on the ledges of the two end Walls to the efi ect that all of the refractory resistor members 19 mey be connected in series-circuit relation, The outerends of the outer resistor members 19 are respec tively lccstecl in a relatively narrow and elongated refractory ccncluctiiig member 21 which extends through the Walls of izhe fur mace and a slioi't'clistance therebeyond.

The outer ends of each of the members 21 may be located in an open-l sp llOX suitably secured against an outer wall cf "the furnace structure, which box is provirled 3C1 no will their with an insulating lining 23 oi any suitable n'lzztei'ial, such as asbestos. The box may be filled with :i mass 24 of .l, gn'imuluir hezite insulating and protecting l'l'ml'Gilfil, such as coke (lust, to such height as lo substantially cover the members 21. A metallic terminal each provizlecl with a, pro

21 reize member 25 may be provided for each of the tiveiy him, flat, eiongated bar 2% of eiectncal Ben-com above the ends e1."

sary. tem attire-resisting ductiiig refractory material has i i/s ends e ing upon the bars 26 to censtifiuie 21:.

roof for the chamber 16. A slab (pr bloc 5 0?? a suitable heaz-insuieting ref? my mrests upon the Neck 2?, the .1

w'xice is such es 130 pt vent the 19'? e; Hie lees from operativ the 0- me beach.) 01" Week" t0 9s M the inner lining '15, to permi the m1 Rs 0 bios-its 2? and 28 v by the ewe? emis 01 the refraci memajiers 19 be them into close eglei'zv iive engagement with "the supporting" 'bei's 18. As e furnace of the above ind character is to be empioyecl fer neat various mewflic eriicies piaeeu in if nece chamber 16, an opening 29 in the from; Wei e'f flue furnace.

Fig. 4C iilusfire'tes e modified form 0? mace strueei'u'e and of the refractory 1' weds. The rods 19 are here iimslil'e'ie.

substantially trapezoidal in lateral mseccien, the grewes in the upper sml we the members 18 emi 21 being of cnriesgmieing cross-section. The rods '19 beiew the menace chamber 16, e refrain plate 31 of any suicabie electrical nnn-- :en--

'ng; material constituting the fiem:

ducti the furnace chambey and Lein e; sul'xpoi'ied by the bars The weighs of the plate and of the bars 26 serves to press the rml'ls 19 into ciese eperetive enge -'enient with conducting bieeks 18 and the blocks 21.

While any suitable or desired resisting material may be empieyefl I found that suimbly prepared carbon bais operate very well in a furnace of the above indicated character.

The ieviee embodying my inveneio'n iihus provides :2, relatively simple furnace strum me in which is ineoi'poi'zm'e e '2 i'esister member min mising e 'giu'rzb snn'aii-zn'ea elongated i'esisnmee red, 5m x'i-hitiveiy simple means lm assembling: and (iiSHFSXYIiJiiEIfI iheln M y arenstruelhm 'i'm' film permii's oi buiiding up the outer fining; 0i" Hm fmnuee and the finer and inner eiemeni. in proper ope-1M. si'f Hn(1.-

therein, the roof or the floor of the uvnnee in :my chamber operzmng, at the same U111 i 3 sure dose epemtwe engagement of" i w w smm 'fmei'nry IQSHi'fil. members wiih the (amnion-t 111;: supporting members.

1 Aliens modi ieatlons may be met e 1;) i 10 (ifiVHIQ embodying my Invention Wit I 1101M) parting; fl'G-XU. the spirit and scope (There 0" Lssszzer in its upper surface, a plurality of elongated refractory resistor members located in parallel spaced-apart relation, with their ends located in the grooves in said conducting blocks the upper surface of said resister members being located above the up per surface of said conducting blocks, and

superposed means for maintaining said resistor members in close operative engags ment with said conducting blocks.

In testimony whereof, I have hereunto subscribed my name this 20th day of Febru ary 1922.

@RA A. COLBY. 

